https://www.superlift.com/suspension-kits?find=dodge-1500-ram-2016-187599
Click on the 6" kit and download the instructions, then click on the 4" kit and download the instructions. If you compare the parts list, the main difference I see is that the 4" kit doesn't include the rear suspension link arm relocation brackets, also would need rear coils etc.
for the front increase...the 6" superlift front lift is identical to the 4" 100%, only difference is they tell you to put the bilstein snapring in the top highest max setting (2.75) versus the 4" says install at lowest setting 0.00 lift. So you can never go higher than 6" lift. Most other kits the "tophat" spacer is taller on the 6" kits so adding bils lets you go even higher, whereas here the bils maxed out is what gives you the 6".
All that said, if you plan to stay with 35's, the superlift/mopar 4" is more than enough lift and will not only look great, but ride nice too.